How can usort() be used to sort a multidimensional array in PHP?

To sort a multidimensional array in PHP using `usort()`, you can define a custom comparison function that compares the elements based on the criteria you want to sort by. This function should be passed as the second argument to `usort()`. Within the comparison function, you can access the specific elements of the multidimensional array that you want to compare. 

// Sample multidimensional array
$students = [
    ['name' => 'Alice', 'age' => 20],
    ['name' => 'Bob', 'age' => 22],
    ['name' => 'Charlie', 'age' => 18]
];

// Custom comparison function to sort by age
usort($students, function($a, $b) {
    return $a['age'] - $b['age'];
});

// Output sorted array
print_r($students);

Keywords

usort multidimensional array sorting PHP function

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